File picture of workers installing solar panels on the roof of the Palexpo Exhibition Center in Geneva, October 12, 2011. The Swiss Green Party presented their strategy for a nuclear phaseout and for a sustainable energy turnaround at a news conference August 14, 2012. REUTERS/Denis Balibouse/Files (SWITZERLAND – Tags: ENVIRONMENT ENERGY POLITICS) SWITZERLAND/ File picture of workers installing solar panels on the roof of the Palexpo Exhibition Center in Geneva